Raising and lowering device for hatch-ventilators



e. w. NORDSTROM.

RAISING AND LOWERING DEVICE FOR HATCH VENTILATORS.

APPLICATION FILED AUG.27. 1920.

1,385,574, Patented July 26, 1921.

2 SHEETS-SHEET l.

an 2 P 6 venioz G. W. NORDSTROM.

RAISING AND LOWERING DEVICE FOR HATCH VENTILATORS.

APPLICATION FILED Aue.21. 1920.

1,385,574. v P te ted July 26, 1921.

2 SHEETS-SHEET 2- UNITED STATES GEORGE W. NORDSTROM, OF BROOKLYN, NEW YORK.

RAISING- AND LOWERING DEVICE FOR HATCH-VENTILATORS.

Specification of Letters Patent.

Application filed August 27, 1920. Serial No. 406,376.

To all whom it may concern Be it known that I, Gnonen -W. NoRns'rRoM, a citizen of the United States,'and resident of 69 Seventy-fifth St, Brooklyn, in the county of Kings and State of New York, have invented certain new and useful improvements in Raising and Lowering Devices for Iilatch-Ventilators, of which the following is a specification.

My invention relates to raising and lowering devices for hatch covers and has for its object to provide a Simple and eflective means for the purpose set forth. 1 accomplish this by means of the mechanism illustrated in the accompanying drawings in which:

Figure 1 is a vertical longitudinal sectional view through a hatch coaming and hatch cover, with the raising and lowering device attached and showing the hatch cover in closed position.

Fig. 2 is a view similar to Fig. 1 but showing the hatch cover held in open position;

Fig. 3 is a vertical transverse sectional view through Fig. 1; and r Fig. 4 is a vertical transverse sectional view through Fig. 2.

Referring more particularly to the draw ings 5 denotes the hatch coaming of a ship and 6 the hatch cover connected to the coaming as by hinges 7.

At the present time the covers 6 used on oil carrying ships are very heavy and in consequence are very generally lifted for ventilating purposes by means of an extensive angle iron frame and block and tackle connections requiringmany men to operate and when lifted and raised the cover is propped open by a bar or the like. Many accidents have been caused by men sent to close the hatch covers, removing the prop bar suddenly and letting the cover drop, this sudden closing of the hatch often causing an explosion.

The present opening and closing device for the hatch cover 6 comprises ashaft 8 suitablymounted in bearings 9 and 10 on the inside of the hatch coaming, one end 11 of the shaft being squared and extending through the coaming for turning by means of a wrench or othertool. Right and left hand threaded portions 12 and 13 respectively are formed on the shaftupon which are mounted correspondingly threaded nuts 14: and 15. Pairs of lower crossed bars 16 and 17 of a lazy tongs 30 are pivotally connected to opposite sides of the nuts 14 and respectively by means of pins or the like 18 and 19, while pairs of upper bars 20 and 21 of the lazy tongs are connected to opposite sides of swivel blocks 22 and 23 respectively as by means of pins 24 and 25, the block 22 being connected to the lug 22' on the hatch cover in any suitable mannor, as by means of a pin 35. Suitable spacing blocks between the bars of each pair serve to brace and maintain the bars in fixed spaced relation to each other.

From the foregoing the operation of the invention will be apparent but may be briefly described as follows: When the operator desires to open the hatch cover he turns the shaft 8 by means of the squared end 11, thus causing the nuts 14 and 15 to travel toward each other on the threaded portions 12 and 13 until the lazy tongs have been straightened out to Fig. 2 position. The closing of the hatch can of course be effected by rotating the shaft in a reverse direction. While I have found in actual practice that the hatch cover will remain in any adjusted position the pawl and ratchet mechanism 26 on the hatch coaming serves to lock the cover in open position. The set screw 27 on the shaft bearing 9 mi ht also be utilized for this purpose.

Flaving thus described my invention, what I claim is: r

In combination with a hatch coaming having a pivoted hatch cover, a shaft rotatably mounted in hearings on the inside of said coaming, said shaft having a squared end extending through the wall of said coaming, oppositely threaded portions on said shaft, correspondingly threaded nuts on said threaded portions, swivel blocks connected to the inside'of said cover, pairs of cross bars pivotally connected to opposite sides of said nuts, and pairs of bars connected to opposite sides of said swivel blocks and to Patented July 26', 1921.

the upper ends of said first mentioned bars. 

